Crossword Genius

Leak permitted by mistake (7)

Ross

I believe the answer is:

letslip

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'leak' is the definition.
I know nothing about this answer so I can't judge whether this works.

'permitted by mistake' is the wordplay.
'permitted' becomes 'let' (to let something happen is to permit it).
'by' says to put letters next to each other.
'mistake' becomes 'slip' (a slip is a blunder or mistake).
'let'+'slip'='LETSLIP'

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I've seen this clue in The Daily Express.
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